Mesa Unicorn

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Lifelink

Enchant creature
Enchanted creature has lifelink. (Damage dealt by the creature also causes its controller to gain that much life.)

Dawnbringer Cleric

When this creature enters, choose one —
• Cure Wounds — You gain 2 life.
• Dispel Magic — Destroy target enchantment.
• Gentle Repose — Exile target card from a graveyard.

Take Heart

Target creature gets +2/+2 until end of turn. You gain 1 life for each attacking creature you control.

Radiant Fountain

When this land enters, you gain 2 life.
{T}: Add {C}.

Celestial Unicorn

Whenever you gain life, put a +1/+1 counter on this creature.

Angelic Wall

Defender (This creature can't attack.)
Flying

Swift Justice

Until end of turn, target creature gets +1/+0 and gains first strike and lifelink.

Plains

Arrester's Zeal

Target creature gets +2/+2 until end of turn.
Addendum — If you cast this spell during your main phase, that creature gains flying until end of turn.

Healer's Hawk

Flying
Lifelink (Damage dealt by this creature also causes you to gain that much life.)